Patents by Inventor Ren Ito

Ren Ito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4490496
    Abstract: A coating composition comprising (A) a thermoplastic resin having a glass transition temperature of 0.degree. to 80.degree. C., (B) a compound having 2 or more hydroxyl groups in the molecule, (C) a thixotropic agent and (D) a solvent, and said coating composition having a viscosity of 3 to 50 poises at 25.degree. C. and a thixotropy of 2 or more can give a moistureproof insulating coating film with uniform and large thickness and very few bubbles by one-time treatment over packing circuit boards.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: December 25, 1984
    Assignees: Hitachi Chemical Co., Ltd., Hitachi, Ltd.
    Inventors: Iwao Maekawa, Eiji Omori, Isao Uchigasaki, Hideyuki Tobita, Naoki Yokoyama, Seikichi Tanno, Fumio Nakano, Ren Ito
  • Patent number: 4454052
    Abstract: A stabilized absorption composition comprising (a) a halogenated hydrocarbon refrigerant, (b) a liquid absorbent of a polyethylene glycol methyl ether and (c) at least one stabilizer selected from phosphite esters, epoxy compounds and organotin compounds is excellent in stability and can be used for an absorption type refrigerator for a long period of time without causing corrosion.
    Type: Grant
    Filed: January 26, 1982
    Date of Patent: June 12, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuyoshi Shoji, Etsuo Oe, Yoshiharu Honma, Shigeki Komatsuzaki, Moriichi Sato, Ren Ito
  • Patent number: 4381886
    Abstract: A liquid crystal display element which may have a multi-layer structure comprising substrates having electrodes and liquid crystal orientation controlling films on the sides thereof facing a liquid crystal layer and one or more liquid crystal layers interposed between said substrates, characterized in that the liquid crystal orientation controlling film is made from a copolymer produced by reacting a dibasic acid dihydrazide, a diamine and a tetracarboxylic acid dianhydride, followed by ring closure and dehydration with heating, is excellent in transparency and the electrode (partially reflected) pattern is hardly observable.
    Type: Grant
    Filed: February 13, 1981
    Date of Patent: May 3, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Hisao Yokokura, Teruo Kitamura, Ren Ito, Fumio Nakano, Hirosada Morishita, Mikio Sato, Yasuhiko Kando
  • Patent number: 4252414
    Abstract: In a liquid crystal display element having a twisted structure wherein the periphery of two transparent glass substrates having electrodes according to desired display patterns is sealed with a sealing medium and a liquid crystal is enclosed in the space thus produced, the one characterized by having an undercoating film of metal oxide on the inner surface of each glass substrate, having a transparent electrode on each undercoating film of metal oxide and having an orientation controlling film made from an organic polymer and having abrasion grooves along a certain direction on each electrode can give a liquid crystal display element excellent in heat resistance of the orientation controlling film, excellent in adhesion to the glass substrates, and the like without causing a voltage drop, or without damaging rising of voltage-brightness property and response property.
    Type: Grant
    Filed: January 5, 1979
    Date of Patent: February 24, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Kiyoshige Kinugawa, Tadashi Ishibashi, Yoshimichi Shibuya, Yasuhiko Kando, Masatoshi Ito, Ren Ito, Satoru Ogihara